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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da989285a260367aec90679e88902babff8e2ee3f462e82e110453ade21a436' 
  AND token = 'vvE/Fidn4ejTK7Shw4vkqO1plHvgzgZWOk9Dz5t8JXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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