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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d2ae0608ea46bd4b6295ff91f0837f21afebd9dab819deff8edd0eb885bdd1' 
  AND token = 'KfyK5KimR6W9EqESyUz32na8vta7fMPhGWBD9lqU+M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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