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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9cb5d75b6595b44fbd0de586d564f2ee7da87891cebc4fe4660538454c1a59' 
  AND token = 'KgC3DqZWPkqgCiFd30zmKrNhZh3+ax3nWxcfkAYcQJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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