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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73386d4019e73116d18dae87f61f1374ab4be88d2ab3f1faf47da01ec9ac836e' 
  AND token = 'n0bbRWRCPnMxGz45rzQM8g/zXqLeM7jRS2VxJfq7zgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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