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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a5e3dd3b6e8566263c754d59e53ae38e849cf3a6c10cb9d69273e466360ac7' 
  AND token = 'BMz2YEIP9nKFY9b1iCj7w2ypTGirOBowUaXixBLBF5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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