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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910f382c39e307367a44eeb36edc9edfbc4a9be34f54f4f66b168c692a3fad97' 
  AND token = 'tO1xV/6cRqS0fqN8/7ek9xSpu0CnFZrruWDpCQHsghY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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