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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f21f93396ba00800876ddc64c02e7c8c2a81e0c8c19b881117563a0e927d184' 
  AND token = 'vvCXs/pD59owd6+ZYuuYX5IMx6pDgiUYns8aElwYyjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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