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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de63acba4aa0c9b62125d718e9f14d6515b6ec5258d190c35e79239afb844358' 
  AND token = 'a3pcB0TDboxpVspPYQPSBcR4POEHZlZB9ecaZVU2dIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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