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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717f74d3c96f2ee0b570f24b67804c4a77abc961e33f0e97b967ecf593ace2e0' 
  AND token = 'StKbgNxDbz/CGwiP5p22m09zeCVJ3n65LgXXe3b46xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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