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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2d3acfda884ef846b482eb42b06c4b1bb7e860ee6bd741f10d77bd86f7ea25' 
  AND token = 'goZbRsL0NBNk+P/lLi3GRyteR/wG0TZ+09pY+N9+gPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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