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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d57f40f97c1c4970cc6a5ae4f881cfc9754254a5a6c1ddc164d8658914c47b' 
  AND token = 'AKhDFwP6M2BUyGQyBK440PbtZ4PSl9ZD0BfDS8kFXtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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