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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c918d5be868528d283f274e0ebec52522ca9ab7c470a4c41e7dfce38e2cd804' 
  AND token = 'PrNW74e+SxhA9m5UyU3hw3ZYlW+gESNBvwq/ml6hbaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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