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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba049bd7215ba30a6f384afb759ca1f78abcea7e4d6b9d9af557bb7cf13e2fb' 
  AND token = 'YtxyXN6wPXyKdGMZF8kli5qtUo/rr/okWZlPWMJRono=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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