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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710bba5c762fb119814a79bb1e9fde0a3d591da25b4a40e5528452c903273eb6' 
  AND token = 'K376x6GtPu0HBeSCb1CT7zjpuYvTc0gtTcnTswz0pzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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