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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd645026f6b5dedf29f82cdc3d4eaee2bbd1072621df0839d492440b83b1553' 
  AND token = 'ksf+fvwtpP5vHnrm1gF+bbCwM+5pZlod7UhtPk1cJh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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