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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d1a125d91d5ffe8f724f20b8d440bc7546043b8b732f9944615a93addfe108' 
  AND token = 'C05Z0D2+Fq8MNRLLERE6fegXiAE4IZJoM5DlRkLk1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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