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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cd55b88602d797618158946c5d1b19a3fab4265d8f3885591cd26e644beada' 
  AND token = 'yNwk2RJAfvQvyhhZzi8or1jhLc2129ohPpr5Fg2sqek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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