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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bf894d1c84d2f0e211c6e1441061d71846cf68b62f7800c4cc543c24d8bc1a' 
  AND token = '8IkIOLH510Pkh3Y4OikVyRkfJPDaDRUnhFonjXZU5FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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