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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b6e821f56cf0df19e919f11e2b9b20ef5874fdb9448e2f97db7d79c7995105' 
  AND token = 'hzA5TNHNvBHZoYAre9/u05rVZFKLeaMz+XsVo8235CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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