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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaf2ce847b9950535b279473cb1ac45194d209e169300ba2e2a6eea21eee374' 
  AND token = 'r7D/DxcM8jt/dsuwQ6ph6ZRn5Usd+LbibRbPr29AYOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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