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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a114c025f121b0ee941d742a3a22fb444454a6abf1328e89b6a505044d9596' 
  AND token = '72zK3Uws0AGwId37P4ti4dNXNehozv5JZ4GLcTs6yyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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