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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfedfabbdaf9d3a4c41e12749841e7c90ad4c992d13165dff280425c46aa66df' 
  AND token = 'wSRM99+DocoGqZK9mV0JHpFcD1PJnLvLKNF0KvcdNeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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