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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cab18c6ac33e223aa0758ed16df79303a045cbb911cf2a74f6e6e92f7b996be' 
  AND token = '8URnaGP8g9oKCKG/tZLLh5PiDxsRWlQn2zt0eo8ylP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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