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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73baa0055a2ad1187c6a24cfedb3ce02881e15f97e5543dfb7d211f4ceb24693' 
  AND token = 'gwAiJbcQ1SRE5TJbgbc4DnlFkEr1OMCYSrYwCB17HOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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