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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00602aab15cdd6b1db89af840998215660859fe59c4c8cbb644441f34cb5038' 
  AND token = 'PmBjEarmpyP0I8xdMjZkpcicc570EeePg28SoHisvHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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