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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0dc28603e7d519a144589e4c13c5296fc6dcb89053773dcb1d6c64e2665367' 
  AND token = 'yDVoGvOtQaCdZwu0W2GWXWe05rAg+3g3TQvqZ3GKup0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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