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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76c3ff4553f131eab1cc80f045f5d064af73cb4c3aa2b974553b70c5eecda22' 
  AND token = '30LNh1KuZiCqpO1tV6dUEw2laEBzMqHMAFFeZ4b5duc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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