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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7592daef6e9c1d4b7bdf44d5304cd1f4d11d259d6fea8fd925192a3a6aad8db' 
  AND token = 'YgdbswjMY5ErvrNluq48f0K4INlD0eeRgB+AyeYWkT0=' 
  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"
    }
  }
}