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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984a4eb4b456d5e0ce629ff0e750288d4e7e8259d2f4ddff0f36dbf31d50c889' 
  AND token = 'v1ct4331AWe8LaYXY3MhxUOvC/hT6ovBZtTwOlxEI7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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