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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2802ede89974f8f2d7dde0e3b7b169bd60b23cdd24e8049d645bbe4dd2b6f966' 
  AND token = 'RQize2Xv87rdeMhkX1xR9tI7XP1MgGIEZf+qSm2RcQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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