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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393b82f72cd25bd99190e25f37eb4c0c43dbe63080467e9aead27c07081aef03' 
  AND token = 'SAPe8TD9dQRGEmtNum8bIcPTuBw3WKKyOj8hZXw92Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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