Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b76f777f3b52cd4fa9cab765a9dc5c008b3117aa7cdcd67cefdf1516bced4a0' 
  AND token = '7jG/H8dYOYPX6uxZ1a07Bjf2VegTIRcGmdZ067u0eK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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