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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3626586323b00f77d23767e81017809ddf3e0a3e2fbc2a1d407182fd1b3593' 
  AND token = 'wJTl5a+sdI8j/5t7OORip8TRvsL6L9hQI/BIMFsblEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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