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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dc466ecb44be0d63a334f2bf0a3437f1b335f5c6c69bd961200f92b0ae3e1e' 
  AND token = 'xbNN40athJCTLbRu4jyQE3/oTpHU3M2zIq+p8NSUxRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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