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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6387ee19d102734c9856253f7bcab1476b7e53cb065cf23b361214cc6d2e9d8c' 
  AND token = 'bLe/ktCOR/shFA1X3Q0jSvmq2KXAjuzc9zlSI67+Gdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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