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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef85a05ace6518adc0f73a13dee14405d90eecf15cfb25d3205b048efbae8998' 
  AND token = '7EPEsJ0EM6efdB4wqMciAuM8SFZ1VMyV3qQgLDQOSko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}