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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ab8f8a7b0afbd3f64a9c2397190b3054cde4388d44e8ab116a653c043837f1' 
  AND token = 'lqXeAxkyBkHClzJdjD71NKPsf/xIdrg+ATMEFIfnRA8=' 
  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"
    }
  }
}