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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b07c99ff67aae5c9301ec800263f65e76dd23256e0f8e0437b2c3c5a2ae2fc' 
  AND token = 'dXSW5PWdC3W617tWpnXFt2VUk3VyaaYhMW8IBWyu1nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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