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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3920fb2ec8e4f6c0af72bc7d3d9d822c0f24c0936185b496c2d4071bc227de' 
  AND token = 'pU4+XOPFNGQP70fiw1obpo8Uepm3Iek60GwECGgLl1A=' 
  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"
    }
  }
}