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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365836f4c7248fa2991fac3557805825f09fbb9b78bc78b37beefac2bef5cc3c' 
  AND token = 'Fl4dBXtX8iNF8VCnU5UfCxHN0WO7UvPI2xYBgslfaf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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