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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36852c936d962782531ad346c3f123d795706eae42f5660db5ee51bd0eda39df' 
  AND token = 'ClB50ZOv5OuLPTCD65b+jXq+LznE5NoqejpqwGsb+1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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