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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4308a7116c257dbafae57a42e31a8e816bc16d7f4762e495c278fa45cbf6115d' 
  AND token = 'z1ZnGWfkmy4z5h1IWL71Xd2Ud3whpI5HQmtsgSbNl+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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