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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9baa70b80483415b089d56c59d8ebde7980e7a07e0f70006f74fbd501c56716' 
  AND token = 'rF3Gw11LtPe+Ov5Fj0+UIzoBySYHtjEhGGanKEGXo00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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