Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3d1987d909aa80588c5292f35699dda003bc54328c0dd02c9a28ecd08b8f88' 
  AND token = 'Im+s+BozIv4NXEMrlyYUvZlziayEJzidrRQTREsIlRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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