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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b642163ecd552dccdc0766c0167a568e357e940e6cdda4a91a4fb3252828a228' 
  AND token = 'NRq0Dp2pbMVOnqr7W1CScR1M87Q+lAz1md1RVyBpaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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