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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aba85a5b7e2fcd579ef1dd2b00815799efb9cf8cbd8f1642ba7f67d2e45f21c' 
  AND token = 'wK4Xm2mjhUAXu0yxU+66B+S2kEdtenj1Q4RCmS+XtRg=' 
  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"
    }
  }
}