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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf8b7ac2683e5a2a7e50f01184fc574ae90089c2fdbc48ac5d7bfbf6c956cb3' 
  AND token = 'vl305estzyeOQPIEWBkLjF/RHCGQBT/qr7GI8cmrU0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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