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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e202843f19707aa6b07846fb64dc43dd55b75b23483c630bd67ef5d6e4a7a4b5' 
  AND token = 'zMSlpf1brr97pjiIrRdBzwlUd9/d0etghdE9b8pT7HI=' 
  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"
    }
  }
}