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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af549cee7c4c4330034742432a5f21128a80d6a87c477e0cfe025707db988b14' 
  AND token = '1IXosrj7K2PwppYMFt5bv36K/sdbYISSu9o2lUAo6mY=' 
  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"
    }
  }
}