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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1809bc8b5612576ce9bc5533195bd0cdfb228d90577b55c4a55581ba8b11b58' 
  AND token = 'nVtZz6ayw3d+TdlFfHCF9Zrp8HB88BkprtFHk9YkiBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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