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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f834058c3e759afb95845c981df92dbfaabeb02f95dae75140e1a7c96f160e0' 
  AND token = 'Y1VZu0f9AepFNw/+VXKXSZL93S3cKXHhnNVu+pqV8LI=' 
  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"
    }
  }
}