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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db91fdfe2bf69a63639e72f8e20909f9860b74f0f54189f3222a451b3702f6d' 
  AND token = 'XeJNjZyAs7gvVEeWqMJQ2cACMQoluDgYy8JLqhnSJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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