SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26155e35d928b674cb949a30b9b387ee8bd8befa4615683d74ef11c1579a2f0a' 
  AND token = '7nziSfHmmKhaLBQY/vd8l3rR1mk63Z7rKUFgVrRPXqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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