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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac340e50dd343fe57c411880126ca04ef9c34929a8b3b03d8be1aca792fe4c4' 
  AND token = 'ZuKHaG7BWaIr+QaxasB4ouQDQnf5FOtzGZyAu6v50fk=' 
  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"
    }
  }
}