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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736bf142b043863d007baf0f9e1bf29ab8b429da0b2cca19dd47d236a84de6b1' 
  AND token = 'wZxeEXRAT91Kj0g2VZecyWRK+AI32dd/R4jwYt7c1Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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