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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4773a3e54fc35213fc8b4eeacf9783f2f8dfe69c41916ef6ab047d2d9c9486d0' 
  AND token = '+zU50IaEEleD8p11kfhjogcVSO1Eri72YEgQQG3tMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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