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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dffa3985cd37a531279d42690270d546d59ac6d13fb57184a6f9b502098a6cf' 
  AND token = 'llrjrxZmeAhe4TS1RGGAvD6yv37pOrqSC/9usQcvy5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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