SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea225979f913b5146b9ebf6e23e0c08faa887b0f0c43d6f02514ed6b0139715e' 
  AND token = 'D8G+/zh8XVEnqfxj7T8YyMWNlrpVYRMSGKQnojd8K7I=' 
  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"
    }
  }
}