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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ee48cefe33b4dbc762f17279ceb1cfdea4d96d1edc74ac2236b865b6badcdf' 
  AND token = 'sodVgbZ0uNduHC4Fy2vMiAjh/NWjKiSaNwKS46BklUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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