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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11204a6fa8de11b72507a2e5b4bddaa44417d7c0c450dce0fa73b853167e4ec0' 
  AND token = 'QXgQ5FY/jYz/86dwZwuw6w/ahS+NXa6tXefz4OSzZiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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