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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920a11e5c5f70e7a7dbec49fcf119b044246a664148bdb6fec9dcba74a9d0faf' 
  AND token = 'fzT9QxP5hH8UA8y4Jh2gLYA4eRoJC9wuuua/JyWVLsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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