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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effc04a41cc12d6598d27901de61e6deb9b80bc18465513f34e13c654fd38801' 
  AND token = 'LH1gRvCM8OYCsfOkwQgPP3YwDssYRcfsCLgGh79Sjzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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