Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98b815e5dea64abdb5254ab073def6e6eced174f53fe35cede4cc55ab2cdda7' 
  AND token = 'F/N+ffhQCqwyRM3PXbIIQbatJ5/nAtGoh+DJT8BWO00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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