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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deae2afad926fe604582655b2b420ae41c280670cff7f7e7550b1f829fe9b709' 
  AND token = '1Kggox0EnI/eq9s0ABG9DLYSmVGTHZ31HsKn7wcIQbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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