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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116d2e50a433eb0edbd2ec73933bb3dc80bad45cad1d3b80a60b61062173c639' 
  AND token = 'E7KFjU83MIcefQvMMEd2ekW9cJwMt3VKA2OUA7U6iVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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