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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166b2787b52f24c8a8170e124c7f2726ea7398d2bed921224b44bb07047bc2b9' 
  AND token = '4+Sz/bvTvDlxVEWmMnpr84Pf9iAPqishy/rAElXau+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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