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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde7e84268aa59790caf2100540dd5a6eae714799e86ec79e76089a431c21db5' 
  AND token = 'FD2j2m0zpC5hsD3xc5DC9MbLf902QXWiDqhvzkxId4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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