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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa19a3dec8a1a6a2c0ae7efa077bf8ad9dae383ab99da2113dfb54b791e5114c' 
  AND token = 'TjPuT66gzhkrIC8zge21T+S2rs2QrNd0jQGfq2LJSac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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