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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fe2c2044b8b7ce1efec8bfef181709480d11dc6fd638786565d6008d95a2e4' 
  AND token = 'zoF06ykh9jMzDdx+HR3SHuek85Exp7UVwl1W4jzRex0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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