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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d29569a41d5d114db43d66b9504b951a3d614b045ab20e6b8b85e8c52efa66' 
  AND token = 'I79F8edmOlXjMg1YILLBF8a3AYrtMyAawbM8kYVJURY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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