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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dd6c94cc693e4b527cac5ad64e024eb44b47c067d4d428cf3bbe71b7ade0c7' 
  AND token = '31XdAUrjQrU3kxTJFolPU9tCg8q19NZUQIZ+o9ldTZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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