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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f82623a9b6c544dd49ac0e459b90f22e19ba166700f85bb796389bbfab5b02b' 
  AND token = '/QtTIo7te8FUA7pdCpbSdChnvb3erBJ//pjd7nat8sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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