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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cab11b1a5c57ebb50a36024d3609414035f6bbda8ef9382f784e95c2b83c4d3' 
  AND token = 'qWd0T4zVDum4XceYQ5aRb3AXSHcuPhZ24aRV+FrD7VI=' 
  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"
    }
  }
}