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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676e54185051b76b9e0503194386980ae0c7c7d283b10610fd57e00222c8a7f7' 
  AND token = 'F3ouKp1GeRTwCuToQZMrxJCP+Qs656jlhdCQX1Utj2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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