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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cda0352a9d624c808427b71162cfa0b5107f46e977bb04a1e87b4d90f91b82' 
  AND token = 'UlrePEEr2QFCgy+B4QCST0bSl9f1JzddeeadSZDv7CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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