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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6868b07ae2c4ebb7ce4712c7ca39f65335c6d54282ff99735ef43458dc868bf6' 
  AND token = 'zew4sini9IfkfwmNSx8PtYpjIk5enJt1UP+OOLi9cAI=' 
  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"
    }
  }
}