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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d17843b446dab130c9b6dafe612cd7fbb73c94b14caf5620cc973b43349047' 
  AND token = 'p7qZgupGh1BprZH9KtC6p2i6VnM1oebv5yVZeoYKDWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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