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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f33415254362a74f8a7e1725574f40a579ba80766f0cecb5d14f715b8f1760' 
  AND token = 'nXhydsQZB1+dkf3ejjc04bmHJQ2PVvt/riPZaAXmaio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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