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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a5e5ee80cb6c743e89b620c585fb20e126335ad13519902f69309a0b4c9498' 
  AND token = '+gNA+mMtv+XymeQDW20P+AtkVk24S4Z0hTA5upQ/FgU=' 
  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"
    }
  }
}