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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886890dcb749be8f1a4a07fb3e7fb389889cfce9087d5c061cda4d81e7ee3bf4' 
  AND token = 'SaiRjRGWzdb1xD90DlULQmY3vHs6dhq2YjG8xBvc2Ew=' 
  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"
    }
  }
}