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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ff514310e9ef60db172bdead2ccbfe48c5b7280213b344e57f8b2eead35613' 
  AND token = 'SL6K2MFclBtf//kZrQHEAQW8YoDe7D4z2DHvFEIn3Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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