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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f056f7c71d13fdc2b45a3091b35ad14ae8b91112165ce4ba2dfb88975b1807ba' 
  AND token = '7YuI6mNaFbT++g9eV0tOLiENPvVPnAwQvtzassTnnH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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