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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b765ed63cd0756a83f2b215f83ac03f0b3a0c0085d7e436d8d694010161e16' 
  AND token = 'ZrCxI0odX5SE83dWbsi7iB5gn7mmgwbipknrPeuKyec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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