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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7faca4476ca4781e0cca678f00c35256c5d0572867500f56d1e94b6d8b50de44' 
  AND token = 'tpFQlV2KteSCSXkjpaL7QcddQzBL2u4Ro9ZsbmOtx6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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