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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc6386c6dd3e42deb6ccedf0b40547cf431f973389d6accf807a535760f8674' 
  AND token = 'DAmHG8YGLMxg701d+hOICO442kMT9XLm0VT+xlPkrTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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