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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6c4776f176e694dfab17e9ac5d996bf4172cfcefc2203b7c79acf64437b54f' 
  AND token = 'DbkfX5wmjhxk50jszdQxJG4K8gV9VdNgWxQ159Ot/MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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