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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45536eca019ccf769ccc3471fcc6d58b29624268c4f40efa38e5168afb8ab381' 
  AND token = 'MEwcH9oAwvHG0biWHlRerOBwN6oEXZ2DIpYM6OxbkXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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