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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3a8ac105567b2917b2101635fe31150d088dfdbce348323511b46176d82360' 
  AND token = 'N9p3EC0NVIFPoz+8Nt1P/xtLMnqMmx9caTg7WhZJcts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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