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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a30ba14d0ee5f29b1fea85ee517cf2546f7d445a05b3468b8a15f071343812' 
  AND token = 'hneBjFv0+PTQ3IVbFLWPFDC5tmNwMXPDjuWWwaOfdas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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