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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9f2959479080c913547ce9aa5526c4d137468e3d3579bd49eca928be8bd76e' 
  AND token = '8CkTsUBzWQJ+w0jBxBtdbX8p3VHHxsogRvBVCPk6eVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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