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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28afbf449c989343f803ef1054f3624e5af64ea4d5ac3a28871d4821bf6de312' 
  AND token = 'bfUVcz3ODv7dEWecExGuzZGBQ1twno7Km6Dc5DwlhWA=' 
  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"
    }
  }
}