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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c541f408f2b178637e85d4a9828d6cd699e744d074cc5961b03a2f6377fe5268' 
  AND token = 'ILrPBLyRtv8LRBgq0mWbjpNrE01gtPsbz9Qw1ha8V9U=' 
  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"
    }
  }
}