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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82732a68cd712a22d2b8555c0f182295ae851c380e8f78ecfcabfa069a5ac01d' 
  AND token = 'NDOA9L37y4882UXQBz1r3B9KmjAZaxYIGcQaTWg1Ljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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