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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0111a1c125082189a6cbfbbf5e1e8c7b409f18a1b3f92ecf0418bf652f08f5b3' 
  AND token = 'FQGw8sXTomtmCyDv17yoWFc54xh8ASO5i+cxIyRujgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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