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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c537d546e481739d6e7ee0dafe895ffd85b34eed3ab5092213b138bcf04be018' 
  AND token = 'jaLPNnqq7gX+IaG5NUmAlIl5lK9UhlSALLOC74JSDp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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