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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b480523ebbc00c2383812a6130bb09c819b360f6e14baf3783f30e939b38cc' 
  AND token = '3C1TtyZ7d7sET53gK+Y1wERw5H+DlTfycDn0h4Lf+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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