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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dddc4edb70a3c59f409a4da479209cfee38b92e40c9c3ac410be6c3900867dd' 
  AND token = 'GvFClFjvS7H86HXrACNeqOifYnRV9NSg918owt9l2Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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